His character would become more cynical. He'd lose his naivete and optimism. Instead of believing in the good of people, he'd see only their flaws.
If Naruto joined the dark side in fanfiction, his character development would be a complete turn - around. He'd start to value power over friendship. He might use his Nine - Tails power in more aggressive and unethical ways, no longer caring about the consequences to others. His sense of humor would probably disappear, replaced with a cold and calculating demeanor.
His character would become more complex. He might start as a naive user of the dark side, thinking he can control it. But as time goes on, it would make him more brooding and solitary. His once bright and optimistic view of the world would be clouded.
His personality would become more aggressive. The once kind - hearted Ezra would be replaced by a more self - centered and power - hungry individual.
If Deadpool joined the X - Men in fanfiction, his character could develop in several ways. He might learn to be more empathetic as he is surrounded by mutants with different backgrounds and struggles. The X - Men's mission of peaceful coexistence could influence him to be less bloodthirsty. Also, being part of a team could give him a sense of belonging that he may not have had before, which could make him more stable and less erratic.
Her character could develop in a more morally ambiguous way at first. Since Orochimaru is a rather shady character, she might start to question her own values. For example, she could become more ruthless in combat as Orochimaru's teachings are often about survival of the fittest. However, as she realizes the error of her ways, she could transform into a more empathetic and wiser character, having learned from her mistakes and the dark side she has witnessed.
He would likely become bitter. Abandonment at a young age can have a huge impact on a character. Dark Naruto might develop a cold exterior and a distrust of others. He may be more prone to using violence as a solution, having grown up without the love and guidance of Kushina.
Naruto's character would become more complex. His initial naivete about the world's darker aspects would quickly disappear. He'd become more cynical as he witnesses the actions of the Dark Brotherhood. His relationships with his old friends in Konoha would also be strained as they might not understand his new allegiance.
Naruto's character would likely become more cynical. His abandonment by family would shatter his once - positive view of the world. He might start to see the world as a cruel place where only the strong survive, leading him to embrace his dark side to gain power.
Naruto's character would become more cynical. He'd lose his usual optimism and be more distrustful of others. His sense of justice might be warped, as he now feels that he has been wronged. He could start to see power as the only thing that matters, rather than the bonds he once cherished.
Ezra would become more ruthless. His once kind and empathetic nature would be replaced with a cold, calculating demeanor. For example, he might not hesitate to sacrifice innocent lives if it served his purpose. His relationships would also change drastically. His friends would become either obstacles to be removed or pawns to be used.
Their relationship could become more of a mentor - mentee type. Itachi, being more experienced, could teach Naruto some of his ninja skills and strategies. Naruto, in turn, could help Itachi see the value in hope and friendship again. They might start to rely on each other more and more as they face the challenges within Akatsuki.